S-99477A610 1/4"-20 x 5/8" Plastic Socket Head Screws

Key Features & Benefits at a Glance

• Corrosion-resistant polypropylene construction ensures reliable performance in humid or chemical environments without rust or degradation
• Precise Class 2A thread fit provides consistent engagement and vibration resistance in assembly applications
• Wide temperature tolerance (-20° to 210°F) maintains structural integrity across diverse operating conditions
• Standard hex drive (3/16") design enables quick installation with common tools while preventing cam-out
• RoHS 3 & REACH compliance meets stringent environmental regulations for industrial and consumer applications
• Coarse UNC threading (1/4"-20) delivers faster installation and superior performance in plastic and soft materials
• Full threading along 5/8" length allows maximum adjustability and secure fastening throughout the engagement area

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these polypropylene socket head cap screws solve critical challenges in electronics, automotive, and consumer goods assembly. The non-conductive, chemically inert material prevents galvanic corrosion when fastening dissimilar materials while providing excellent electrical insulation. The coarse UNC thread profile ensures secure fastening in plastic components and soft substrates where fine threads might strip. With right-hand threading and standard socket head profile, these fasteners enable high-torque installation in confined spaces where traditional screw heads won't fit. The temperature-resistant properties make them ideal for applications experiencing thermal cycling without compromising mechanical performance.

Specification Summary & Compliance

This 1/4"-20 UNC socket head cap screw features Class 2A thread tolerances per unified screw thread standards, ensuring precise fit and reliable performance. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for regulated industries. The coarse thread spacing and fully threaded 5/8" length provide consistent engagement while the 0.25" thread diameter maintains standard compatibility across applications requiring 1/4"-20 UNC fasteners.